Understanding the Contributions of Operations, Technology, and Design to Meeting Highway Capacity Needs (2012)

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81 A p p e n d i x A Supplemental Materials for Uninterrupted Flow Facilities Table A.1. Information Provided in TransGuide Database Column Units Description Date Date of data as MM/DD/YYYY Time Time of data as HH24:MI:SS Lane Lane N; N ranges from 1 to the number of lanes at the location. Roadway Route number and direction ID Unique detector identifier Speed Mph Format: Speed = pp Volume Veh Format: Volume = ppp Occ % Format: Occ = ppp

82 Table A.2. Information Provided in Bay Area Database Column Units Description Timestamp Date of data as MM/DD/YYYY HH24:MI:SS. Note that the time indicates the beginning of the summary period. For example, a time of 08:00:00 reports measurements from between 08:00:00 and 08:59:59. Station Unique station identifier. Use this value to crossreference with metadata files. District District number Route Route number Direction of Travel N S  E  W Station Type CD = Coll/Dist FF = Fwy-Fwy HV = HOV FR = Off-Ramp OR = On-Ramp ML = Mainline Station Length Segment length covered by the station in miles/km. Samples Total number of samples received for all lanes. % Observed % Percentage of individual lane points at this location that were observed (e.g., not imputed). Total Flow Veh/5-minutes Sum of flows over the 5-minute period across all lanes. Note that the basic 5-minute rollup normalizes flow by the number of good samples received from the controller. Avg Occupancy % Average occupancy across all lanes over the 5-minute period expressed as a decimal number between 0 and 1. Avg Speed mph Flow-weighted average speed over the 5-minute period across all lanes. If flow is 0, mathematical average of 5-minute station speeds. Lane N Samples Number of good samples received for Lane N. N ranges from 1 to the number of lanes at the location. Lane N Flow veh/hour Total flow for Lane N over the 5-minute period normalized by the number of good samples. Lane N Avg Occ % Average occupancy for Lane N expressed as a decimal number between 0 and 1. N ranges from 1 to the number of lanes at the location. Lane N Avg Speed mph Flow-weighted average of Lane N speeds. If flow is 0, mathematical average of 5-minute lane speeds. N ranges from 1 to the number of lanes. Lane N Observed 1 indicates observed data, 0 indicates imputed.

83 Table A.3. Summary of Fitted Queue Discharge Model Queue Duration Intervals (includes pre-breakdown) Number of Instances (5 queue duration) Number of Instances (<– queue duration) Fitted Parameters and GOF GOF with c 5 1,850 and  5 0.2 c  R2 RMSE R2 RMSE 2 94 94 1,934 0.1950 0.9116 97.57 0.9092 98.92 3 54 148 1,876 0.1589 0.8676 131.87 0.8655 132.90 4 39 187 1,872 0.1724 0.8658 121.76 0.8647 122.24 5 53 240 1,843 0.1791 0.8415 111.18 0.8410 111.37 6 56 296 1,838 0.1855 0.8228 103.94 0.8225 104.02 7 108 404 1,840 0.2035 0.7759 95.78 0.7757 95.81 8 53 457 1,848 0.2132 0.7441 98.48 0.7438 98.54 9 15 472 1,842 0.2115 0.7379 99.03 0.7375 99.11 10 6 478 1,842 0.2127 0.7306 100.19 0.7301 100.27 11 6 484 1,838 0.2117 0.7282 100.49 0.7277 100.59 12 5 489 1,832 0.2072 0.7318 102.35 0.7312 102.47 13 4 493 1,822 0.1986 0.7445 103.53 0.7437 103.68 14 1 494 1,817 0.1953 0.7467 103.73 0.7459 103.90 19 1 495 1,798 0.1771 0.7724 104.26 0.7707 104.64 Note: GOF = goodness of fit; c = average discharge rate in pc/h/ln; b = linear parameter that models the strength of regression to the mean.